Free Health Calculators
Body composition and pregnancy calculators, grounded in commonly used clinical formulas — for informational purposes, not medical advice.
Health calculators
About These Calculators
Health calculators are some of the most-searched calculation tools on the web, and DoCalc's approach is the same as everywhere else on the site: free, instant, no signup, and grounded in real, commonly cited formulas — the Devine formula for ideal weight, the U.S. Navy method for body fat, and Naegele's rule for pregnancy due dates — rather than made-up shortcuts.
Every calculator here runs entirely in your browser and provides general estimates for informational purposes only. None of it is a substitute for professional medical advice.
Frequently asked questions
What health calculators does DoCalc offer?
An Ideal Weight, Body Fat & Water Intake Calculator (Devine formula and U.S. Navy method) and a Pregnancy Due Date Calculator (Naegele's rule). Both are free and require no signup.
Are these tools a substitute for medical advice?
No — every calculator here provides general estimates for informational purposes only, not medical advice. Always consult a healthcare provider for medical decisions.
Will more health calculators be added?
Yes, alongside the SaaS, Finance, Insurance, Real Estate, and Utilities categories — Health is the newest category on DoCalc.